Semiconductor manufacturing is a highly demanding process that requires precision and coordination across every aspect of production. Product quality and performance depend on strict control over manufacturing, facilities, tooling, processes and operations. One of the fundamental factors in achieving these objectives, however, is the advanced environmental control provided by cleanroom technologies. Microscopic particles can adversely affect semiconductor functionality, as even the smallest particle can interfere with manufacturing processes and compromise the integrity of the final product.
In this article, we focus on the design of semiconductor manufacturing facilities and production equipment. Effective planning begins with the client’s active involvement and commitment to collaboration, requiring an in-depth dialogue between both parties to establish the key design criteria. These criteria form the basis of what could be considered the planning “bible”: the Equipment Utility Matrix, a crucial tool used to define the function of each piece of process equipment and its associated utilities within the cleanroom environment, and upon which the rest of the design is developed.
Once the requirements have been defined, the appropriate cleanroom configuration can be established. Three main layouts are commonly used in semiconductor cleanroom construction:
1. “Ballroom” Cleanroom
A ballroom cleanroom is used when large, open production areas are required. These spaces can be reconfigured throughout the facility’s operational life to accommodate new products and evolving manufacturing technologies.
2. “Service Area with Chases” Cleanroom
This type of cleanroom incorporates dedicated service areas and utility chases, providing a configurable layout that allows additional equipment and services to be installed without compromising the cleanliness of the controlled environment required for semiconductor manufacturing.
3. “Mini-Environment” Cleanroom
A mini-environment provides a smaller, dedicated controlled environment within the main cleanroom. It creates specific environmental conditions within a defined area to meet more stringent requirements for particular processes or sensitive equipment. In essence, it creates a smaller, highly controlled environment within the main cleanroom.
Although each configuration has its own advantages and disadvantages, experience in cleanroom construction generally favours the “Service Area with Chases” cleanroom approach, as it maintains the reconfiguration capability that is essential in environments where technologies and manufacturing processes are constantly evolving.
To accommodate the infrastructure required for semiconductor operations, facilities are often designed with a three-level configuration. The lower level typically serves as a basement and service area, the intermediate level houses the cleanrooms where most production activities take place, and the upper level accommodates technical infrastructure and equipment.
In a building designed to house cleanrooms, numerous systems must remain continuously operational, including those responsible for temperature and pressure control, chemical waste removal, gas quality and detection, compressed air, electrical power, deionised water and central vacuum systems. The result is a highly complex network of interconnected infrastructure.
Despite this complexity, these considerations represent only one part of semiconductor manufacturing facility design. Many additional factors must also be addressed, including equipment connections, contamination — even at the molecular level — electromagnetic interference, the specific lighting requirements of each area and vibration control. Vibration is particularly critical, as even extremely small movements can disrupt manufacturing processes and potentially affect the entire production line.
As can be seen, all these factors have a significant impact on both the planning and cost of a semiconductor manufacturing facility. For this reason, the design phase is critical to the success of every project and must be approached with clearly defined objectives and informed decision-making, given the wide range of concepts, configurations and design alternatives available.